Document
S-5843A Series
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TEMPERATURE SWITCH IC (THERMOSTAT IC)
Rev.2.2_00
The S-5843A Series is a temperature switch IC (thermostat IC) which detects the temperature with a temperature accuracy of ±2.5°C. The output inverts when temperature reaches the detection temperature. The S-5843A Series restores the output voltage when the temperature drops to the level of release temperature. The S-5843A Series operates at the lower power supply voltage of 1.65 V and its current consumption is 4.5 μA typ. due to CMOS configuration. A temperature sensor with the negative temperature coefficient, a reference voltage generation circuit, a comparator and a delay circuit are integrated on one chip, and enclosed into the packages SOT-23-5 and SNT-6A.
Features
• Detection temperature:
TDET = +40°C to +120°C, +1°C step, detection accuracy: ±2.5°C
• Low voltage operation:
VDD = 1.65 V min.
• Low current consumption:
IDD = 4.5 μA typ. (Ta = +25°C)
• Hysteresis temperature:
selectable in 2°C, 4°C, 10°C or 20°C
• Selectable output logic in active "H" or "L"
• Selectable output form in CMOS or Nch open drain
• Prevent functions for false detection operation and false release operation
• Operation temperature range: • Lead-free, Sn 100%, halogen-free*1
Ta = −40°C to +125°C
*1. Refer to " Product Name Structure" for details.
Applications
• Fan control • Air conditioning system • Mobile phone • Game console • Various electronic devices
Packages
• SOT-23-5 • SNT-6A
Seiko Instruments Inc.
1
TEMPERATURE SWITCH IC (THERMOSTAT IC) S-5843A Series
Block Diagrams
1. CMOS output product
VDD
Temperature sensor
+ −
Delay circuit
Logic circuit (selectable)
Reference voltage generation circuit
VSS
2. Nch open drain output product
VDD
Figure 1
RT
Temperature sensor
+ −
Delay circuit
Logic circuit (selectable)
Reference voltage generation circuit
VSS
Figure 2
RT
2 Seiko Instruments Inc.
Rev.2.2_00
DET
DET
Rev.2.2_00
TEMPERATURE SWITCH IC (THERMOSTAT IC) S-5843A Series
Product Name Structure
Users are able to select the detection temperature, output form and logic, hysteresis temperature and package for the S-5843A Series.
1. Product name
1. 1 SOT-23-5
S-5843A xx x x - M5T1 x
Environmental code U: Lead-free (Sn 100%), halogen-free S: Lead-free, halogen-free
Package abbreviation and IC packing specifications*1 M5T1: SOT-23-5, Tape
Hysteresis temperature*2 A: 2°C B: 4°C C: 10°C D: 20°C
Output form and output logic*3 A: CMOS output, active "H" B: CMOS output, active "L" C: Nch open drain output, active "H" D: Nch open drain output, active "L"
Detection temperature (TDET)*4 40 to 99, A0 to A9, B0 to B9, C0
1. 2 SNT-6A S-5843A xx x x - I6T1 U
Environmental code U: Lead-free (Sn 100%), halogen-free
Package abbreviation and IC packing specifications*1 I6T1: SNT-6A, Tape
Hysteresis temperature*2 A: 2°C B: 4°C C: 10°C D: 20°C
Output form and output logic*3 A: CMOS output, active "H" B: CMOS output, a.